A sento mural is a large landscape painting drawn directly on the wall of a bathhouse bathing area. The standard motif is Mount Fuji, and it is widely known as the iconic view of the sento bath space. Its origin is said to be Kikai-yu in Kanda-Sarugakucho, Tokyo, in 1912, after which it spread to bathhouses across Japan. One major difference from museum paintings is that it is placed where bathers look up at it while soaking.

This article explains what a sento mural is, why Mount Fuji appears so often, its unexpected link with advertising, the work and rarity of the mural painters who repaint it in a short time, what makes it interesting to look at, and how it is changing today. Retro sento culture such as Miyazukuri exteriors, the bandai counter, and Kerorin buckets is covered in Retro Sento and Showa Bathhouse Architecture.

What Is a Sento Mural?

A sento mural is a large background painting drawn directly on the wall of a sento bath area with oil-based paint. In many cases, it covers the entire large wall behind the tubs in the men’s or women’s bath, placed where bathers can look up at it from the water.

Its role is not limited to decoration. Because bath areas often have few windows and feel enclosed, painting distant mountains or the sea across the whole wall creates visual depth and a sense of openness. The common composition of Mount Fuji with sky, and the sea or a lake in the foreground, is also tied to the practical need for a scene that feels spacious.

It is also important to note that this is a different tradition from ceramic tile paintings made by firing designs onto tiles. A sento mural is painted directly on the wall and can be repainted, while a tile painting is fixed as a ceramic work. Even though both are bathhouse wall art, their materials and production methods are completely different.

Why Is Mount Fuji So Common?

There are several reasons why Mount Fuji dominates sento murals.

First, it is an instantly recognizable symbol of Japan. Second, its simple ridgeline reads clearly even from a distance, so it looks striking when painted large on a steamy bath wall. Third, it has long been regarded as auspicious and has been favored as a celebratory subject.

Historical circumstances also mattered. The first Mount Fuji mural at the said Kikai-yu is said to have been chosen because the painter, who was commissioned for the job, selected a subject linked to his home prefecture of Shizuoka. Once that first painting became popular, other bathhouses followed suit, and Fuji murals became the standard. The familiar composition of Mount Fuji with the sea, lake, and pines has been passed down in this way.

That said, folk theories that other subjects should be avoided, such as claims that red Fuji or sunset scenes are unpopular because they evoke fire, are often discussed but lack clear evidence and remain only one of several theories. In fact, examples of red Fuji and evening scenes do exist, so they should not be treated as fixed rules.

The Relationship Between Sento Murals and Advertising

The rapid spread of Mount Fuji murals across Japan is said to have been driven by an unexpected mechanism: advertising.

As the reputation of these background paintings grew, businesses reportedly began offering to place company ads below or around the murals, using the ad revenue to cover the cost of painting them. Bathhouse owners could display an impressive work without bearing the full expense, while advertisers could reach many eyes in the post-bath setting. This alignment of interests helped sento murals spread alongside advertising business.

For that reason, a composition in which the mural sits where bathers naturally look and ads are placed below it became one of the defining features of sento mural culture. Today, many murals no longer include ads, but traces of the era when painting and advertising were integrated can still be seen in bathhouses across Japan.

The Painter’s Work and Its Rarity

Sento murals are painted by specialized background artists, known as sento painters. Their biggest feature is the way they repaint an entire mural without keeping the bathhouse closed for long, often finishing the work in a single day.

Because sento are expected to operate daily, repainting is done during limited time, such as on closing days or before opening. The painter sets up scaffolding and, with almost no preliminary sketch, quickly blocks in the sky, mountains, and water surface using rollers and brushes. To finish a large wall in a short time, careful planning and speed are essential once the composition is already in mind. Not only the finished picture itself, but also this process of repainting while the bathhouse continues operating, lies at the heart of the sento painter’s craft.

Today, only a very small number of artists continue this work full time. There were once said to be several dozen, but as the number of sento has declined, demand has shrunk as well, and only a few names such as Kiyoto Maruyama, Morio Nakajima, and Mizuki Tanaka are widely known as painters based in Tokyo. Because the number of practitioners is limited, even the existence of a classic sento mural in active use is increasingly valued as part of Japan’s cultural heritage.

What Makes It Interesting to Look At

Because a sento mural is designed to be viewed from below while bathing, it looks very different from framed art in a gallery. A Mount Fuji floating beyond the steam, or the color of the sky descending from high on the wall, becomes memorable because it is inseparable from the bath space itself.

Even when the subject is Mount Fuji, the colors and composition vary greatly depending on the painter and the bathhouse. Visiting several sento reveals those differences. Some separate the designs between the men’s and women’s baths, so not being able to compare both sides makes the mural on the side you enter even more enjoyable.

To make those differences easier to spot, the following points are useful:

Even if the changing room or exterior has been newly renovated, some sento still preserve a traditional mood only in the bath mural. That contrast between old and new architecture is part of the appeal.

Please note that photography is prohibited in most bath areas. Even a wonderful mural is something you are generally meant to remember rather than capture on camera.

How It Is Changing Today

The situation surrounding sento murals has changed significantly in recent years.

First, more sento no longer have murals at all. During renovations, some facilities choose not to install wall art, while others switch to tile paintings or modern murals. Mount Fuji is no longer the only answer; expressions in bath spaces are becoming more diverse from bathhouse to bathhouse.

Second, there are also new developments within the mural tradition itself. A small number of painters continue to respect the classic Mount Fuji composition while incorporating local scenery and characters tied to the area. Some murals are even used in advertising, and the technique is increasingly introduced outside the bathhouse world.

The differences between sento murals, tile paintings, and modern wall art can be summarized as follows:

Bathhouses that still display traditional sento murals are becoming more notable as cultural highlights within this broader diversification. The movement toward modernized bathhouses is covered in What Modern Sento Are Like, and the culture of Tokyo bathhouses with hot springs is covered in Tokyo Onsen Sento Culture.

Frequently Asked Questions

Why are there so many Mount Fuji pictures in sento?

Mount Fuji is an easy-to-understand landscape that symbolizes Japan, its ridgeline is simple and clearly visible from a distance, and it has long been considered auspicious. In addition, the first mural at the said Kikai-yu featured Mount Fuji, and that popular work helped spread the style nationwide.

Who paints sento murals?

They are painted by specialized background artists, known as sento painters. Their hallmark is repainting an entire wall quickly without keeping the bathhouse closed for long, often before opening. Today, only a very small number continue this work full time, and names such as Kiyoto Maruyama, Morio Nakajima, and Mizuki Tanaka are well known in Tokyo.

Since when have sento murals been painted?

They are said to have originated in 1912, when Kikai-yu, a bathhouse in Kanda-Sarugakucho, Tokyo, displayed a background painting on the bath wall. The first subject was reportedly Mount Fuji, chosen by a painter who had received a commission and selected a scene linked to his hometown. From there, the style spread to bathhouses across Japan.

Can I take photos of sento murals?

In many bathhouses, photography in the bath area is prohibited. This is to prevent other users from being captured in photos, and even if you only want to photograph the mural, it is generally best to refrain from taking pictures inside the bath area. Rules differ by facility, so follow posted notices and staff guidance.

Are the murals different in the men’s and women’s baths?

Some sento divide the design between the two baths, while others use one continuous composition across both sides. In some cases, the scenes differ between men’s and women’s baths, so seeing what is painted on the wall of the side you entered becomes part of the day’s enjoyment.

Conclusion

A sento mural is a large landscape painting on a bathhouse wall, and the composition centered on Mount Fuji is its symbol. Originating at Kikai-yu in 1912, it spread nationwide through its clarity, auspicious meaning, and a system tied to advertising. It has been sustained by painters who can repaint it in a short time without stopping business, but today only a very small number remain.

In recent years, more bathhouses have moved away from murals, and tile paintings and modern wall art have become more common, making bath space expression increasingly diverse. Within that change, bathhouses where classic sento murals are still active are gaining value as cultural highlights. When you visit a sento, looking at the wall art while bathing reveals a great deal about the character of that particular bathhouse. Basic sento etiquette is covered in How to Enjoy a Sento, and the institutional differences between onsen and sento are explained in The Difference Between Onsen and Sento.

Sources

• Chiyoda City, "Town Memory Preservation Plate Guide: The First Sento Mural"
• Tokyo Bathhouse Association (Tokyo Sento), "I Am a Sento Mural Painter" by Mizuki Tanaka
• Tokyo Bathhouse Association (Tokyo Sento Map), "Sento Mural"
• nippon.com, "A Sento Mural Painter’s Work — Mizuki Tanaka"